Ah thought I saw a Helium browser mentioned recently on HN[0] and thought this was the same thing. So this is not the same as this Helium browser [1]?
The cool part about Helium is that it's based on patches, rather than forking the full source code. I don't know how sustainable this is in the long term, but it's an interesting approach for sure.
1. Checkout Chromium's codebase.
2. Make a commit and see how long it takes.
3. Try to push it to any git hosting service.
And yes, being 10s vs 10000s devs in the same repo isn't fun.